The Surge Guard 34850 Portable 50 Amp RV Surge Protector is portable with an LCD display. It offers a very high power surge protection: up to 50A - 3850 Joules, and continuously monitors for voltage, amp draw and reverse polarity. This surge protector is a must have on every RV trip to ensure your power is safe. The compact design is very easy to use, just plug in your 50 Amp cord and be protected. NOTE: Any surge protector can be used with any amperage, with the use of an adapter.